Of an old noun formation pattern seen in remnants in Classical Syriac such as ܢܸܣܝܘܿܢܵܐ (nesyōnā).
ܦܸܪܫܘܿܢܵܐ • (piršōnā) m (plural ܦܸܪ̈ܫܘܿܢܹܐ (piršōnē))